I discovered (with help from Jerry M) that the drain and fill plugs in my 3/69 build date Muncie M22 transmission were likely from either a late 1969 or post 1969 production M22. The plugs are made by Lisle and I have seen them stamped with a P, W (with underline), the Lisle script only, with the Lisle Magnetic 2 script and Lisle Magnetic 3 script. The Lisle Magnetic 2 design is correct for my transmission build date and most early/mid 1969 and prior M22 production transmissions. The Lisle Magnetic 2 plugs also have a unique dual spade magnet design (see "bottom view" photo).

Looks good Lloyd. Those are correct per my discussion with Jerry as well. Here's the plugs that are on my Z's original M22. After Jerry rebuilt it, he requested follow-up pics for his files and research. Confirmed original for the car/trans. Built date of the car is 04B. Note that the trans came with two magnetic plugs - both the same.

Looks good Lloyd. Those are correct per my discussion with Jerry as well. Here's the plugs that are on my Z's original M22. After Jerry rebuilt it, he requested follow-up pics for his files and research. Confirmed original for the car/trans. Built date of the car is 04B. Note that the trans came with two magnetic plugs - both the same.

Nice work on documenting the different plugs Lloyd. I was unaware until now that the M22 had a drain plug. Great detail here, keep up the good work.

All M22's had a drain plug. The cast boss for it was on all Muncie cases, but it was only drilled/tapped for a plug on M22's and on ALL Muncies starting in 1970. Many rebuilders also added the drain plug to pre-1970 Muncies.

Another picture showing plugs from both sides. From left to right. LISLE MAGNETIC 2LISLE magnetic P magnetic W fill plug (note - not magnetic)No marks magnetic - current plug that is not correct, but is functional for the task. I have about 100 of these new.

Another picture showing plugs from both sides. From left to right. LISLE MAGNETIC 2LISLE magnetic P magnetic W fill plug (note - not magnetic)No marks magnetic - current plug that is not correct, but is functional for the task. I have about 100 of these new.

Another picture showing plugs from both sides. From left to right. LISLE MAGNETIC 2LISLE magnetic P magnetic W fill plug (note - not magnetic)No marks magnetic - current plug that is not correct, but is functional for the task. I have about 100 of these new.